Some recent experimental work in Japan on fast fracture and crack arrest
✍ Scribed by Machida Susumu; Yoshinari Hitoshi; Kanazawa Takeshi
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 823 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
In this paper, two experiments on brittle crack run-arrest behavior using structural steels are briefly described with the analysis based on dynamic fracture mechanics. From the experiment using a modified double-tension specimen, it is shown that the arrestability of brittle crack is very much associated with the formation of shear lips, which are closely related to plastic deformation around the crack tip. But the conditions controlling initiation and growth of shear lips are not fully known at present. From the other experiment using very-wide-plate duplex-type brittle crack run-arrest specimens, it is shown that the crack-arrest toughness values obtained are quite different from those values evaluated from the standard-size temperaturegradient-type crack-arrest test, even when compared on the basis of dynamic fracture-mechanics analysis. Further work is necessary to explain this large effect.